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Why is TRIAC's operation unstable when connected to small loads?

Latest Updated:04/01/2008

Question:

I am using the triac, but its operation is unstable when connected to small loads. Why is this so?

Answer:

The minimum current of the triac is defined as holding current that is the minimum on-state current at which the ON state can be maintained. Holding current of a product with large rated RMS on-state current is large. If a product with a large rated RMS on-state current is used with a small load, the on-state current falls below the holding current, causing malfunctioning.
Use a product with a small holding current.
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